president obama and the first lady michelle obama gathered on the south lawn to observe a moment of silence. the president visited the pentagon in arlington national cemetery. this visit to the pentagon has become a bit of a tradition wend dal? >> the civilians and women were killed in the pentagon in addition to the 59 passengers and crew aboard the american airlines flight. it included a number of their loved ones. >> will never fully understand ow difficult it is to carry on. sum monday the strength and rebuild your lives. no matter how many years passed no matter how many times we come together on this hallowed ground know this. you will never be alone. your loved ones will never be forgotten. >> after the ceremony the president and first lady visited section 60 of arlington national cemetery which is reserved for servicemen and women killed in iraq. >> the presidential campaign and the activity surrounding it are really on hold for this day. >> supposedly though republicans say one of the president's campaign advisors didn't get the message. mitt romney told the national guard associat